var one = new Vue({
    el: '#vue-app-one',
    data: {
        title: 'app one 的内容'
    },
    methods: {

    },
    computed: {
        greet: function () {
            return 'hello app one'
        }
    }
});
var two = new Vue({
    el: '#vue-app-two',
    data: {
        title: 'app two 的内容'
    },
    methods: {
        changeTitle: function () {
            one.title = '已经改名了'
        }
    },
    computed: {
        greet: function () {
            return 'hello app two'
        }
    }
});